<DOC>
<DOCNO>
1211
</DOCNO>
<TITLE>
boundary layer transition at supersonic speedsthree-dimensional
roughness effects (spheres).
</TITLE>
<AUTHOR>
van driest,e.r. and blumer,c.b.
</AUTHOR>
<BIBLIO>
</BIBLIO>
<TEXT>
  further experiments carried out in the 12-in. supersonic wind
tunnel of the jet propulsion laboratory of the california institute
of technology to investigate the effect of three-dimensional
roughness elements (spheres) on boundary-layer transition on a
the local mach number for these tests was 2.71 .  the data show
clearly that the minimum (effective) size of trip required to bring
transition to its lowest reynolds number varies as the one-fourth
power of the distance from the apex of the cone to the trip .  use
of available data for other mach numbers indicates that the
mach-number influence for effective tripping is taken into account
by the simple expression .
some remarks concerning the roughness variation
for transition on a blunt body are made .
</TEXT>
</DOC>
